75-26-17 PILATUS AIRCRAFT LTD: Amendment 39-2466. Applies to Pilatus Model PC-6/A airplanes up to and including S/N 659 (all variants) with Astazou engine installations manufactured by Pilatus Aircraft Ltd.
NOTE: This AD does not apply to Pilatus Model PC-6/A airplanes manufactured by Fairchild Hiller.
Compliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished.
To prevent failure of the engine mount to fuselage attachment, reinforce the U-channel, P/N 6201.992, by installing a steel plate, P/N 112.35.06.337, to each U-channel lug and rework the engine strut heads, P/N 6501.106, in accordance with paragraph 2.2 of Pilatus Aircraft Ltd. Service Bulletin No. 83A dated February 1971, or an FAA-approved equivalent.
This amendment becomes effective on January 17, 1976.